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Analog Devices Inc. LTC1144IS8#PBF
- Part No.:
- LTC1144IS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1144IS8#PBF.pdf
- Description:
- IC REG CHARGE PUMP INV 50MA 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:318
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Product details
Overview
LTC1144IS8#PBF from Analog Devices (formerly Linear Technology) is a monolithic CMOS switched-capacitor voltage converter that inverts a positive input (2V–18V) to a complementary negative output (–2V to –18V). It features internal power MOSFETs, a programmable oscillator (10kHz base, up to 100kHz with BOOST), 120Ω max output resistance at 15V/20mA, and shutdown current of 8µA. It enables compact, low-cost negative supplies in data acquisition systems and battery-powered instrumentation.
For engineers reviewing the LTC1144IS8#PBF datasheet, LTC1144IS8#PBF pinout, LTC1144IS8#PBF application, or LTC1144IS8#PBF equivalent, key selection criteria include input voltage range compatibility, oscillator frequency control via BOOST/OSC pins, shutdown quiescent current, output impedance vs load, and SOIC-8 thermal performance (θJA = 130°C/W).
Technical Context
The LTC1144IS8#PBF implements a four-MOSFET charge-pump architecture with divide-by-two logic and voltage level shifting. Its oscillator supports three modes: free-running (10kHz at V+ = 15V), capacitor-tuned (COSC on Pin 7), or external clock drive - enabling ripple and efficiency trade-offs across 1kHz–100kHz.
Internal protection includes substrate isolation logic preventing N-channel switch turn-on, and absolute maximum ratings specify indefinite short-circuit tolerance only for V+ ≤ 10V. Output regulation relies on fixed-ratio inversion without feedback, yielding 99.9% open-circuit voltage conversion efficiency but load-dependent output impedance governed by 1/(f × C₁) and MOSFET RDS(on).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2V to 18V DC - supports single-cell LiFePO₄ up to 15V wall adapters without external regulation. |
| Output Voltage | –2V to –18V (inverted, ratio ≈ –1×) - no feedback loop; accuracy depends on capacitor matching and load. |
| Oscillator Frequency | 10kHz (default), up to 100kHz with BOOST tied to V+ - higher f reduces output impedance and ripple at cost of switching loss. |
| Max Output Resistance | 120Ω at V+ = 15V, IL = 20mA, f = 10kHz - defines worst-case voltage droop under load; drops to 56Ω typical. |
| Shutdown Current | 8µA at TA = 25°C - enables ultra-low-power sleep mode in portable systems with periodic wake-up. |
| Power Efficiency | 93% typical at RL = 2kΩ, 10kHz - declines at low f (1/(f×C) dominates) and high f (switching loss dominates). |
| Operating Temp | –40°C to +85°C - qualified for industrial environments; junction limit 110°C with θJA = 130°C/W in SOIC-8. |
Pinout & Package
Package: 8-Lead Plastic SOIC (S8), narrow body (0.150"), RoHS-compliant lead-free finish (PBF). Thermal resistance θJA = 130°C/W; max junction temperature 110°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST (Pin 1) | Oscillator frequency multiplier enable | Tie to V+ to raise fOSC ~10×; critical for lowering output impedance at high load currents. |
| CAP+ (Pin 2) | Positive pump capacitor terminal | Connects to C₁ anode; carries full switching current - use low-ESR 10µF electrolytic/tantalum. |
| GND (Pin 3) | Ground reference | Common return for all internal circuitry and external capacitors; must be low-inductance node. |
| CAP– (Pin 4) | Negative pump capacitor terminal | Connects to C₁ cathode and C₂ anode; forms charge-transfer path with CAP+. |
| VOUT (Pin 5) | Negative output terminal | Delivers inverted voltage; output impedance combines MOSFET RDS(on) and 1/(f×C₁) term. |
| SHDN (Pin 6) | Active-low shutdown control | Pull to GND to disable oscillator and reduce IQ to 8µA; float or tie to V+ for normal operation. |
| OSC (Pin 7) | Oscillator timing/control input | Accepts external clock or sets fOSC via COSC capacitor; Schmitt-trigger input tolerates TTL/CMOS logic. |
| V+ (Pin 8) | Positive supply input | Primary power source; absolute max 20V transient, 18V continuous - requires local 0.1µF bypass. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated power MOSFETs | Four on-chip switches eliminate external discrete FETs and gate drivers - reduces BOM count and layout area. |
| Programmable oscillator | Three configuration modes (free-run, capacitor-tuned, external clock) allow optimization of ripple, efficiency, and EMI profile. |
| Low shutdown current | 8µA quiescent draw enables >1-year battery life in intermittent-sampling sensor nodes using SHDN control. |
| No external diodes required | On-chip MOSFETs replace lossy external diodes - improves efficiency and eliminates reverse leakage at temperature extremes. |
| Wide input range support | 2V–18V operation accommodates aging batteries, unregulated wall adapters, and automotive transients without pre-regulation. |
Applications
| Portable Data Acquisition | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Battery-powered handheld multimeter acquiring bipolar analog signals from ±10V sensors. IC Role / Device Role / Timing Role: Generates stable –10V rail from 9V alkaline stack for op-amp bias and ADC reference. Use Value: Eliminates need for isolated DC/DC or dual-output transformer; 120Ω output resistance ensures <10mV droop at 1mA load. | Use Scenario: 4–20mA transmitter with HART modulation requiring clean ±15V supplies for analog front-end. IC Role / Device Role / Timing Role: Inverts 24V loop supply to –15V rail while maintaining 93% efficiency at 5mA load. Use Value: SOIC-8 package fits tight PCB space; –40°C to +85°C rating ensures reliability in field enclosures. |
| Battery-Splitter for Single-Supply Systems | Ultra-Precision Voltage Division |
Use Scenario: Portable oscilloscope using 18V Li-ion pack to derive symmetrical ±9V rails for analog amplifiers. IC Role / Device Role / Timing Role: Configured as battery splitter (Figure 11) to generate balanced outputs referenced to common ground. Use Value: Achieves 0.002% division accuracy with <100nA load - suitable for metrology-grade references. | Use Scenario: Calibration equipment requiring sub-ppm voltage ratios for DAC testing. IC Role / Device Role / Timing Role: Operates as zero-drift inverting amplifier substitute with fixed gain = –1 and no op-amp offset drift. Use Value: Open-circuit voltage conversion efficiency of 99.9% minimizes ratio error from loading effects. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switched-capacitor voltage converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1054CN8#PBF | Higher output current (100mA vs 20mA), wider VIN (3.5V–15V), DIP-8 only | Supports heavier loads but lacks BOOST pin for frequency scaling; no –40°C rating | Choose LTC1054 for >50mA loads where SOIC-8 and extended temp are not required. |
| LTC1046CS8#PBF | Lower input range (1.5V–6V), lower max VOUT (–3V), 200µA IQ, same SOIC-8 package | Optimized for low-voltage battery systems (e.g., 3.3V logic rails); not suitable for 15V inputs | Choose LTC1046 for sub-6V applications needing ultra-low quiescent current and small size. |
Compared with LTC1144IS8#PBF, LTC1054 offers higher current but sacrifices industrial temperature range and SOIC-8 footprint, while LTC1046 trades input voltage headroom for lower IQ and smaller system voltage - neither matches the LTC1144IS8#PBF's combination of 18V input, –40°C to +85°C, and BOOST-enabled frequency tuning.
Availability
LTC1144IS8#PBF is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor interfaces, battery-powered test equipment, and precision analog signal chains requiring stable component supply and long-term obsolescence management.
Supply support for LTC1144IS8#PBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices acquired Linear Technology in 2017; Linear pioneered high-performance analog ICs including precision voltage converters, regulators, and signal conditioning products.
The LTC1144 product line delivers robust, low-component-count switched-capacitor voltage inversion for applications where size, cost, and reliability outweigh the need for regulated output or high current - targeting portable, battery-operated, and space-constrained industrial systems.
FAQ
What is the maximum safe input voltage for LTC1144IS8#PBF during transient conditions?
The LTC1144IS8#PBF has an absolute maximum transient supply voltage rating of 20V on the V+ pin. Continuous operation must remain within 2V to 18V. Exceeding 20V, even briefly, risks permanent damage due to oxide breakdown or latch-up. Designers should include clamping (e.g., TVS diode) if system-level transients exceed this limit. The LTC1144IS8#PBF datasheet specifies this in the Absolute Maximum Ratings table on page 2.
Can LTC1144IS8#PBF generate regulated output voltages like –5V from a 9V input?
Yes - the LTC1144IS8#PBF can generate a regulated –5V output when used with external components such as a Zener diode or shunt regulator (e.g., Figure 12 in the datasheet). The base LTC1144IS8#PBF provides unregulated inversion; regulation requires adding feedback elements. For example, a 36kΩ/300kΩ resistor divider and 2N2369 transistor can stabilize VOUT at –5V across 0–5mA load. The LTC1144IS8#PBF itself does not contain internal regulation circuitry.
How does BOOST pin operation affect output impedance and efficiency of LTC1144IS8#PBF?
Tying the BOOST pin (Pin 1) to V+ increases the oscillator frequency by ~10× (e.g., from 10kHz to 100kHz), which lowers output impedance - e.g., from 120Ω to ~56Ω at 15V/20mA - improving load regulation. However, efficiency drops slightly above ~50kHz due to increased switching losses. The LTC1144IS8#PBF datasheet confirms this trade-off in Figure TPC05 and TPC11, showing peak efficiency near 10kHz for typical loads.
Is LTC1144IS8#PBF pin-compatible with older LTC1144 variants like LTC1144CS8#PBF?
Yes - the LTC1144IS8#PBF shares identical pinout, package dimensions (8-lead SOIC), and electrical functionality with LTC1144CS8#PBF and LTC1144IN8#PBF. The only differences are operating temperature range (–40°C to +85°C vs 0°C to +70°C) and guaranteed parametric limits over that extended range. No PCB or schematic changes are needed when upgrading from CS8 to IS8, making LTC1144IS8#PBF a direct drop-in replacement for industrial designs.
What external capacitors are recommended for LTC1144IS8#PBF in a 15V-to–15V converter?
For a 15V-to–15V inverter using LTC1144IS8#PBF, two 10µF aluminum or tantalum electrolytic capacitors are recommended: C₁ (CAP+ to CAP–) and C₂ (CAP– to VOUT). These values are noncritical, tolerate ±20% tolerance, and need no special ESR rating. The LTC1144IS8#PBF datasheet validates this in Figure TA01 and states "capacitors are not critical" in Applications Information (page 7). Ceramic capacitors are discouraged due to microphonic effects and voltage coefficient issues.
LTC1144IS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Ratiometric
- Output Configuration:
- Positive or Negative
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- -Vin, 2Vin, Vin/2
- Voltage - Output (Max):
- -
- Current - Output:
- 50mA
- Frequency - Switching:
- 4kHz ~ 10kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC1144IS8#PBF FAQ
1.How can I place an order for LTC1144IS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1144IS8#PBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC1144IS8#PBF reliable?
The price and inventory of LTC1144IS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1144IS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1144IS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1144IS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1144IS8#PBF?
LTC1144IS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1144IS8#PBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC1144IS8#PBF?
For technical support, including LTC1144IS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1144IS8#PBF requirements.
6.How does Aetrix verify that LTC1144IS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1144IS8#PBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC1144IS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1144IS8#PBF?
All LTC1144IS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1144IS8#PBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC1144IS8#PBF part is unused and in its original packaging.
Return procedure for LTC1144IS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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